Care for sisyrinchium

Spritzhenry answered this here on Sisyrinchium striatum. 15 Aug 2008 to save you looking it up here is the quote - Spritzhenry said 'I just cut out the flower stems and pull off the black leaves to tidy the plants up. Sometimes I take off a fan or two if they are getting a bit crowded, and plant them up elsewhere or in a pot for a friend!'

And if its a really large clump, you can dig them up and split them in half and replant the sections.